A) \[4mnu\]
B) \[2mnu\]
C) \[1.5mnu\]
D) \[0.8mnu\]
Correct Answer: B
Solution :
Force experienced by the surface is equal to change in momentum in one second. From Newtons second law of motion, the rate of change of momentum of a body is equal to the external force applied on the body and the change in momentum always takes place in the direction of the force. Momentum of ball before impact\[=mu\] Momentum after impact\[=-mu\] Change in momentum\[=mu-(-mu)=2mu\] Change in momentum due to n balls in one second is\[=2mnu\]. Change of momentum = force experienced per second\[=2mnu\].
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